package com.awakening.active;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * @Author:AwakeningCode
 * @Date: Created in 11:21 2018\2\7 0007
 */
@ChannelHandler.Sharable    //标示一个ChannelHandler可以被多个Channel安全地共享
public class EchoServerHandler extends ChannelInboundHandlerAdapter{

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf in = (ByteBuf)msg;
        System.out.println("Server received: " + in.toString(CharsetUtil.UTF_8));//将消息记录到控制台
        ctx.write(in);//将接受到的消息写给发送者，而不冲刷出站消息·
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        //将未决消息冲刷到远程节点，并且关闭该Channel
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();//打印异常栈跟踪
        ctx.close();//关闭该Channel
    }
}
